﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information
// 
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// 

using System;
using System.Text;
using System.Globalization;

namespace log4net.DateFormatter
{
    /// <summary>
    /// Formats a <see cref="DateTime"/> as <c>"dd MMM yyyy HH:mm:ss,fff"</c>
    /// </summary>
    /// <remarks>
    /// <para>
    /// Formats a <see cref="DateTime"/> in the format 
    /// <c>"dd MMM yyyy HH:mm:ss,fff"</c> for example, 
    /// <c>"06 Nov 1994 15:49:37,459"</c>.
    /// </para>
    /// </remarks>
    /// <author>Nicko Cadell</author>
    /// <author>Gert Driesen</author>
    /// <author>Angelika Schnagl</author>
    public class DateTimeDateFormatter : AbsoluteTimeDateFormatter
    {
        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <remarks>
        /// <para>
        /// Initializes a new instance of the <see cref="DateTimeDateFormatter" /> class.
        /// </para>
        /// </remarks>
        public DateTimeDateFormatter()
        {
            this.m_dateTimeFormatInfo = DateTimeFormatInfo.InvariantInfo;
        }

        /// <summary>
        /// Formats the date without the milliseconds part
        /// </summary>
        /// <param name="dateToFormat">The date to format.</param>
        /// <param name="buffer">The string builder to write to.</param>
        /// <remarks>
        /// <para>
        /// Formats a DateTime in the format <c>"dd MMM yyyy HH:mm:ss"</c>
        /// for example, <c>"06 Nov 1994 15:49:37"</c>.
        /// </para>
        /// <para>
        /// The base class will append the <c>",fff"</c> milliseconds section.
        /// This method will only be called at most once per second.
        /// </para>
        /// </remarks>
        protected override void FormatDateWithoutMillis(DateTime dateToFormat, StringBuilder buffer)
        {
            int day = dateToFormat.Day;
            if (day < 10) 
            {
                buffer.Append('0');
            }
            buffer.Append(day);
            buffer.Append(' ');		

            buffer.Append(this.m_dateTimeFormatInfo.GetAbbreviatedMonthName(dateToFormat.Month));
            buffer.Append(' ');	

            buffer.Append(dateToFormat.Year);
            buffer.Append(' ');

            // Append the 'HH:mm:ss'
            base.FormatDateWithoutMillis(dateToFormat, buffer);
        }

        /// <summary>
        /// The format info for the invariant culture.
        /// </summary>
        private readonly DateTimeFormatInfo m_dateTimeFormatInfo;
    }
}
